Note that you have to be very careful with negative years.
There was a huge debate on one of the xmlschema lists about 8601's
intentions in this area.
Something about whether the year "0" actually existed, and consequently what
is the meaning of a year designated as "0" in a particular encoding.
I believe that the resolution is that 0=-1, -1=-2, etc, but please make sure
to check if you care about that level or accuracy.
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